Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a96e2f47245c1…

MALICIOUS

PDF

91.7 KB Created: 2021-06-27 05:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c0a63f41b1e0fc94e325bd122288316d SHA-1: e8219d44bca4bc07bdb58ad4329f1afa8ec85239 SHA-256: 639a96e2f47245c156840f4cdb0e75e2645603c360f59b528e1063c3005c4beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=ascribed+status+examples PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b0c073ff---62409839927.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607557edaedc2---kobiwixekelenolaxozi.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224667150602.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d543b33eee4b584bdc8e4ac7acc3e9b/1606318143.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2606a8645574105ca4ce7ab772298382/wufovixek.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i7th7varbvuog45drfguspapnr/37123366844.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3c1ed50a0b1198c05c2f5821ad071a4c/bifefumulepozirozo.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/dadulupexevuvimofagelis.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/keronasokitapa.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/85567770030.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wamir.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/fomagoxeguginejitosevox.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576bfde2ae---5596939435.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5f0f6de172c59c0e5dc5f70028e682be/gawom.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e71e5213f---11430882934.pdfIn PDF document text
    • http://splogservice.ru/content/file/78211691997.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/30075123694.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d78ac95c5---68365349937.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a766968c412---sijunabufej.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qh3n6ol6pj86v469ljbfn7ls90/tozoxutudamadoxizapavar.pdfIn PDF document text
    • http://rjt1.org/upload/files/deloxodoludefejidusotufu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee964ca05b---kumizi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b0084b6---47240298823.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50a7d723e---52146222114.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10772 bytes
SHA-256: 461a3d96446862e92a06eeaf0f08d7848d2ebda7768efa18249e52931ccec5f8
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16728 bytes
SHA-256: c091f426ecdc29270f98b99fc283cdf5641f52fff938c6fdbea27bda64aa53bf
font_02_sfnt_off0001499e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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